The DaVinci Code
I guess WebQuests have truly arrived in the mainstream. There's a lot of buzz around the web about the new DaVinci Code Web Quest which is part of a viral marketing campaign to promote the movie coming out next May and to sell a few more copies of the book to the handful who don't already have it (mostly cavedwellers in Borneo). The quest is a series of puzzles to solve that start out easy and move on towards impossible.
So that's what a WebQuest is, eh? A sequence of puzzles? I think not. Perhaps the authors of the site would agree since they carefully label it as a "Web (space) Quest".
Give it a try, though. If you like puzzles and word play you'll have fun with it. Just don't call it a WebQuest.